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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
A reconciliation of the numerators and denominators of the basic and diluted EPS computations is presented below:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2016
 
2015
 
2016
 
2015
 
(In thousands, except per share amounts)
Amounts attributable to common stockholders:
 
 
 
 
 
 
 
Net income:
 
 
 
 
 
 
 
Net income — basic
$
15,620

 
$
52,595

 
$
63,065

 
$
113,970

After tax interest on convertible debt
10

 
12

 
22

 
25

Net income — diluted
$
15,630

 
$
52,607

 
$
63,087

 
$
113,995

Weighted average shares (denominator):
 
 
 
 
 
 
 
Weighted average shares — basic
193,806

 
202,466

 
194,366

 
202,966

Stock options
2,788

 
4,159

 
2,975

 
4,134

Restricted stock units
3

 
—

 
1

 
—

Convertible debt
121

 
121

 
121

 
121

Weighted average shares — diluted
196,718

 
206,746

 
197,463

 
207,221

Net income per share:
 
 
 
 
 
 
 
Basic
$
0.08

 
$
0.26

 
$
0.32

 
$
0.56

Diluted
$
0.08

 
$
0.25

 
$
0.32

 
$
0.55